-

cool-RR · cool-RR · commit 132f4e62b221 · 2014-10-19T21:55:58.000+03:00
diff --git a/source_py3/python_toolbox/math_tools/types.py b/source_py3/python_toolbox/math_tools/types.py
@@ -13,18 +13,18 @@ def __instancecheck__(self, thing):
         return isinstance(thing, numbers.Integral) or (thing in infinities)
 class PossiblyInfiniteIntegral(numbers.Number,
                                metaclass=_PossiblyInfiniteIntegralType):
-    pass
+    '''An integer or infinity (including negative infinity.)'''
 
 class _PossiblyInfiniteRealType(abc.ABCMeta):
     def __instancecheck__(self, thing):
         return isinstance(thing, numbers.Real) or (thing in infinities)
 class PossiblyInfiniteReal(numbers.Number,
                            metaclass=_PossiblyInfiniteRealType):
-    pass
+    '''A real number or infinity (including negative infinity.)'''
 
 class _NaturalType(abc.ABCMeta):
     def __instancecheck__(self, thing):
         return isinstance(thing, numbers.Integral) and thing >= 1
 class Natural(numbers.Number,
               metaclass=_NaturalType):
-    pass
+    '''A natural number, meaning a positive integer (0 not included.)'''
